So yeah, Harvestcraft crops can't be crafted into seeds. I tried crafting it in my inventory and in a vanilla bench with no success. I double checked the config and the croptoseedrecipe setting is set to true but I am still unable to craft them. I am going to check if there is an id conflict and come back to you.

I am currently running the 0.3.0 version of the modpack and forge version 12.17.0.1965. I have not changed any of the configs but I have removed the Spice Of Life mod.

This isn't a botania issue, is it? ._.

I checked before I posted this and couldn't find anything on this specific issue, so I assume that it's not.
Also, there is no id conflict that I can find.
I found another bug: when you right click the harvestcraft gardens you can't pick them up. EnableEasyHarvest is set to true.

You might want to check this repository. This is for Botania, which has not come up once in any of your comments.

If you'd like to report a harvestcraft bug please go to https://github.com/MatrexsVigil/harvestcraft